期刊
CHIRALITY
卷 23, 期 5, 页码 367-373出版社
WILEY
DOI: 10.1002/chir.20933
关键词
enantiomeric excesses; homochirality; symmetry breaking; electronic circular dichroism; circularly polarized light
资金
- ARC [AUWB-08/13-ULB3]
- Fond National de la Recherche Scientifique (FRS-FNRS, Belgium)
Amino-acid enantiomeric excesses (ee's) have been detected in different types of carbonaceous chondrites, all in favor of the L enantiomer. In this article, we discuss possible deterministic causes to the presence of these amino-acid ee's in meteorites and evaluate in particular enantioselective photolysis by circularly polarized light (CPL). The electronic circular dichroism spectra of a set of amino- and hydroxy-acids, all detected in chondritic matter but some with ee's and others without ee's, were calculated and compared. The spectra were calculated for the most stable conformation(s) of the considered molecules using quantum mechanical methods (density functional theory). Our results suggest that CPL photolysis in the gas phase was perhaps not at the origin of the presence of ee's in meteorites and that the search for another, but still unknown, deterministic cause must be seriously undertaken. Chirality 23: 367373, 2011. (c) 2011 Wiley-Liss, Inc.
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